<template>
  <div class="memory-game">
    <h1>记忆翻牌游戏</h1>
    <div class="game-info">
      <div>分数: {{ score }}</div> 
      <div>剩余配对: {{ remainingPairs }}</div> 
      <div>尝试次数: {{ tries }}</div> 
      <button @click="resetGame" class="reset-btn">重新开始</button>
    </div>
    <div class="cards-container" :style="gridStyle">
      <div
      v-for="(card, index) in cards" :key="index" class="card" 
      :class="{ flipped: card.isFlipped, matched: card.isMatched }" 
      @click="flipCard(index)"
      >
      <div class="card-face card-front">
        <img :src="card.image" :alt="'卡片' + card.value" />
      </div> 
      <div class="card-face card-back"></div>
      </div>
    </div> 
    <div v-if="gameOver" class="game-over">
      <h2>恭喜你赢了！</h2> 
      <p>你的最终得分: {{ score }}</p> 
      <p>总尝试次数: {{ tries }}</p> 
      <button @click="resetGame" class="reset-btn">再玩一次</button>
    </div>
  </div>
</template> 
<script> 
import { ref, computed, onMounted } from "vue";
export default {
  setup() {
  // 卡片图片 - 实际项目中应该放在 public 或 assets 目录 
  const cardImages = [
    "https://picsum.photos/id/10/100/100", 
    "https://picsum.photos/id/11/100/100", 
    "https://picsum.photos/id/12/100/100", 
    "https://picsum.photos/id/13/100/100", 
    "https://picsum.photos/id/14/100/100", 
    "https://picsum.photos/id/15/100/100", 
    "https://picsum.photos/id/16/100/100", 
    "https://picsum.photos/id/17/100/100",
  ];
  // 游戏状态 
  const cards = ref([]); 
  const flippedCards = ref([]); 
  const score = ref(0); 
  const tries = ref(0); 
  const gameOver = ref(false); 
  const difficulty = ref("medium"); // easy: 4x2, medium: 4x4, hard: 6x6
  // 计算属性 
  const remainingPairs = computed(() => {
    const totalPairs = cards.value.length / 2; 
    const matchedPairs =
    cards.value.filter((card) => card.isMatched).length / 2;
    return totalPairs - matchedPairs;
  });
  const gridStyle = computed(() => {
    let columns;
    switch (difficulty.value) {
      case "easy":
        columns = 4; 
        break;
      case "hard":
        columns = 6; break;
      default:
        columns = 4;
    } 
    return {
      "grid-template-columns": `repeat(${columns}, 1fr)`,
    };
  });
  // 初始化游戏
  const initializeGame = () => {
    gameOver.value = false; 
    score.value = 0; 
    tries.value = 0; 
    flippedCards.value = [];
    // 创建卡片对 
    let cardValues = []; 
    const pairsCount =
      difficulty.value === "easy" ? 4 : difficulty.value === "hard" ? 18 :
      8;
      for (let i = 0; i < pairsCount; i++) {
        const imgIndex = i % cardImages.length; 
        cardValues.push({ value: i, image: cardImages[imgIndex] }); 
        cardValues.push({ value: i, image: cardImages[imgIndex] });
      }
      // 洗牌 
      cardValues = shuffleArray(cardValues);
      // 创建卡片状态 
      cards.value = cardValues.map((card) => ({
        ...card, isFlipped: false, isMatched: false,
      }));
    };
    // 洗牌算法 
    const shuffleArray = (array) => {
      const newArray = [...array]; 
      for (let i = newArray.length - 1; i > 0; i--) {
        const j = Math.floor(Math.random() * (i + 1)); 
        [newArray[i], newArray[j]] = [newArray[j], newArray[i]];
      } 
      return newArray;
    };
    // 翻牌 
    const flipCard = (index) => {
      const card = cards.value[index];
      // 如果卡片已经翻开或已匹配，则不做任何操作 
      if (card.isFlipped || card.isMatched || flippedCards.value.length >=
      2) {
        return;
      }
      // 翻开卡片 
      card.isFlipped = true; 
      flippedCards.value.push(index);
      // 如果翻开了两张卡片，检查是否匹配 
      if (flippedCards.value.length === 2) {
        tries.value++; 
        const [firstIndex, secondIndex] = flippedCards.value; 
        const firstCard = cards.value[firstIndex]; 
        const secondCard = cards.value[secondIndex]; 
        if (firstCard.value === secondCard.value) {
          // 匹配成功 
          firstCard.isMatched = true; 
          secondCard.isMatched = true; 
          score.value += 10; 
          flippedCards.value = [];
          // 检查游戏是否结束 
          if (cards.value.every((card) => card.isMatched)) {
           gameOver.value = true;
            score.value += remainingPairs.value * 5; // 剩余配对奖励
          }
        } else {
          // 匹配失败，翻回去 
          setTimeout(() => {
            firstCard.isFlipped = false; 
            secondCard.isFlipped = false; 
            flippedCards.value = [];
          }, 1000);
        }
      }
    };
    // 重置游戏 
    const resetGame = () => {
      initializeGame();
    };
    // 改变难度 
    const changeDifficulty = (level) => {
      difficulty.value = level; 
      initializeGame();
    };
    // 初始化游戏 
    onMounted(() => {
    initializeGame();
    });
    return {
      cards, flipCard, score,
      tries, remainingPairs, gameOver, resetGame, 
      changeDifficulty, gridStyle, difficulty,
    };
  },
}; 
</script> 

<style scoped>
.memory-game {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}
.game-info {
    display: flex;
    justify-content: space-around;
    margin-bottom: 20px;
    padding: 10px;
    background-color: #f0f0f0;
    border-radius: 8px;
}
.cards-container {
    display: grid;
    grid-gap: 10px;
    margin: 0 auto;
    justify-content: center;
}
.card {
    position: relative;
    width: 100px;
    height: 100px;
    cursor: pointer;
    transform-style: preserve-3d;
    transition: transform 0.6s;
    perspective: 1000px;
}
.card.flipped {
    transform: rotateY(180deg);
}
.card-face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}
.card-front {
    background-color: white;
    transform: rotateY(180deg);
}
.card-back {
    background: linear-gradient(135deg, #6e8efb, #a777e3);
    color: white;
    font-size: 24px;
}
.card.matched .card-front {
    background-color: #e0f7fa;
    border: 2px solid #4dd0e1;
}
.reset-btn {
    padding: 8px 16px;
    background-color: #4caf50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
}
.reset-btn:hover {
    background-color: #45a049;
}
.game-over {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    z-index: 100;
}
.difficulty-selector {
    margin-bottom: 20px;
}
.difficulty-btn {
    padding: 8px 16px;
    margin: 0 5px;
    background-color: #2196f3;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
 .difficulty-btn.active {
    background-color: #0b7dda;
}
</style>